- Design, build and maintain high performance, reusable, and reliable Java & Kotlin code
- Writing unit-tests code for robustness, including edge cases, usability, and general reliability
- Take ownership of product/features: End to end development with testing and meet the deadline
- Work closely with our product and design teams to customize the Khatbook experience for the Android platform.
- Prototype new and redesign features.
- A focus on UI design principles and making apps work intuitively.
- Contribute best-in-class programming skills to develop highly innovative, consumer-facing mobile products.
- Writing efficient android code in Java/Kotlin following MVP framework guidelines.
- Tracing and profiling android java code. Own and manage the finance technology control frameworks.

About KhataBook Office
About
Connect with the team
Similar jobs
Position: Senior React Native Developer (4- 7 years)
Location: Remote (Company in Mumbai)
Company: Big Rattle Technologies Private Limited
Immediate Joiners only.
Summary:
We're looking for a seasoned React Native developer who has shipped production-grade mobile apps on both iOS and Android — ideally in the high-traffic, high-stakes world of e-commerce. You'll own the mobile experience end-to-end: architecture, performance, and flawless UX across devices.
Note: We are looking for a senior expert who has delivered multiple apps that are built from scratch and hosted on Apple Store/ Play Store i.e. e2e lifecycle.
KEY RESPONSIBILITIES
- Design and build scalable React Native apps for both iOS and Android from scratch to App Store / Play Store deployment.
- Architect complex e-commerce flows — product catalogues, cart, checkout, payment gateway integration, and order tracking.
- Optimize app performance: reduce TTI, maintain smooth 60fps animations, and manage memory on low-end devices.
- Integrate REST and GraphQL APIs; manage state with Redux Toolkit, Zustand, or React Query.
- Implement push notifications, deep linking, in-app navigation, and offline-first strategies.
- Write clean, well-tested code; maintain CI/CD pipelines using Fastlane, GitHub Actions, or Bitrise.
- Collaborate with designers, backend engineers, and product managers in Agile sprints.
- Conduct code reviews and mentor junior mobile developers.
Required Skills:
Core Mobile
▸ React Native CLI & Expo
▸ TypeScript
▸ React Navigation v6+
▸ iOS (Swift basics) & Android (Kotlin basics) ▸ Xcode & Android Studio
E-commerce & Integrations
▸ Product / Cart / Checkout flows
▸ Razorpay, Stripe, PayPal SDKs
▸ Wishlist, search UX, filters
▸ Order tracking & delivery status
▸ Push notifications & deep linking
State & Data
▸ Redux Toolkit / Zustand
▸ React Query / SWR
▸ REST & GraphQL APIs
▸ AsyncStorage / MMKV
▸ Firebase Realtime DB / Firestore
DevOps & Tooling
▸ Fastlane & GitHub Actions / Bitrise
▸ Jest (unit) & Detox (E2E)
▸ Firebase Crashlytics & Sentry
▸ Flipper / Reactotron
▸ App Store & Play Store deployments
Nice to Have skills: New Architecture · RN Web · AR try-on · RTL support · Shopify SDK · WCAG · Maps SDK
- React Native New Architecture (JSI / Fabric / TurboModules)
- React Native Web or monorepo setups (Nx, Turborepo)
- AR product try-on experiences (ARKit / ARCore)
- Shopify Storefront API or WooCommerce SDK experience
- Accessibility (WCAG mobile) implementation
- Live order-tracking maps (Google Maps / Mapbox)
Required Qualifications:
- Bachelor’s degree in Computer Science, Engineering, or a related technical field.
Why should you join Big Rattle?
Big Rattle Technologies specializes in AI/ ML Products and Solutions as well as Mobile and Web Application Development. Our clients include Fortune 500 companies. Over the past 13 years, we have delivered multiple projects for international and Indian clients from various industries like FMCG, Banking and Finance, Automobiles, Ecommerce, etc. We also specialise in Product Development for our clients.
Big Rattle Technologies Private Limited is ISO 27001:2022 certified and CyberGRX certified.
What We Offer:
- Opportunity to work on diverse projects for Fortune 500 clients.
- Competitive salary and performance-based growth.
- Dynamic, collaborative, and growth-oriented work environment.
- Direct impact on product quality and client satisfaction.
- 5-day hybrid work week.
- Certification reimbursement.
- Healthcare coverage.
- Must have 3+ Years of experience with Hyrbid App Development
- Must have 2+ Years of Experience with Cordova / Ionic
- Priority will be given to candidates having experience in developing Cordova Plugins
- Good Communication Skills (English)
- Should have 5+ hardcore experience in Android Mobile App development
- Proficient in Kotlin, Android SDK with Location tracking, Route map, Google Map/ Voice API Integration, Regional language support etc.
- Understanding of design patterns and mobile architecture using frameworks such as MVVM / MVC / MVP.
- Familiarity with RESTful APIs and integration and code versioning tools such as Git.
- Problem solver with good analytical skills.
- Passion to work in dynamic, start-up environment.
- Compensation best in the industry
-Flutter: To build cross-platform mobile apps for Android, IOS, and Web. Should include making responsive UIs to efficiently query data and manage states in an optimized manner
-Design and Build sophisticated and highly salable apps using Flutter.
-Translate and Build the designs into a high-quality, responsive UI code.
-You will be writing readable and clear code using Dart that can be extensively documented for future use and upgrades.
-Write unit and UI tests to identify malfunctions.
-Design interfaces to improve user experience
-Research and suggest new mobile products, applications, and protocols.
-Stay up-to-date with new technology trends.
-Knowledge and understanding of Firebase.
-Experience in working with remote data via REST and JSON.
-Work on bug fixing and improving application performance.
-Continuously discover, evaluate, and implement new technologies to maximize development efficiency.
Skills:
-Good working knowledge of Database concepts
-High quality & optimized code
-Strong knowledge of JSON & the REST API is an added advantage
Requirements:
-Minimum 1 to 3 years of experience
-Good communication
-Willingness to learn new technology
-Analytical skills
-Team player
-Quick & Independent-learner
-Problem-solving skills
We are looking for a React Native developer who can build a performant mobile app on both the iOS and Android platforms. We’re looking to take our dashclicks.com web app and turn portions of it into an amazing mobile app.
You will be responsible for architecting and building this app, as well as coordinating with the teams responsible for other layers of the product infrastructure. Building a product is a highly collaborative effort, and as such, a strong team player with a commitment to perfection is required.
Responsibilities:
- Transition existing React web apps to React Native.
- Build pixel-perfect UIs across both mobile platforms (iOS and Android).
- Design and develop highly complex application components, and integrate software packages, programs and reusable objects
- Leverage native APIs for deep integrations with both platforms.
- Diagnose and fix bugs and performance bottlenecks for performance that feels native.
- Maintain code and write automated tests to ensure the product is of the highest quality.
- Make use of additional JavaScript libraries such as Redux to make asynchronous API calls as well as improve the performance of the apps
- Perform real-time monitoring and fixing crashes.
- Plan the data and presentation layer of the applications’ front-end Implement pixel-perfect UI's that match designs.
- Implement clean, modern, smooth animations and transitions that provide an excellent user experience.
- Write unit and integration tests. Work with native modules when required.
Skills:
- 3+ years of experience in React Native (iOS and Android).
- Have a deep knowledge of Redux architecture
- Must have worked with Firebase Database and Firm grasp of the JavaScript language and its nuances, including ES6+ syntax
- Strong understanding of back-end and front-end technologies such as NodeJS, React.JS, Web Socket, Pub-Sub, TypeScript, HTML5, CSS and CSS-In-JS.
- Knowledge of object-oriented programming
- Ability to write well-documented, clean JavaScript code
- React assumptions concepts like Virtual DOM, JSX, Component State and component lifecycle
- Rock solid at working with third-party dependencies and debugging dependency conflicts
- Familiarity with native build tools, like XCode, Gradle, Android Studio, IntelliJ
- Understanding of REST APIs, the document request model, and offline storage
- Knowledge of monitoring tools like crash reporting and analytics
- Knowledge of functional or object-oriented programming
- Experience with automated testing suites, like (Jest or Mocha)
- Understanding of mobile UI frameworks like Native Base, UI Kitten, Material Kit etc.
- Experience implementing authorization and authentication workflows using JWT, OAuth2 etc.
Things that make us the World’s leading white-label marketing software development company:
- We do not outsource any of our fulfillment services.
- We offer a fully white-labeled dashboard allowing our users’ clients to log in and see their accounts’ progress.
- We offer educational and prospecting tools to help businesses generate growth and revenue.
What do we bring to the table?
- Competitive base pay and benefits package with exciting growth plans.
- A chance to work with professionals across various areas of expertise on a product loved by 30,000+ marketing agencies worldwide.
- 9 hours a day & 5 days a week working structure.
- A chance to learn & grow in a fast-paced environment, driving transformational growth for our brand.
- Fully remote work offers you the chance to balance your professional and personal life.
Come join us on this journey, we're looking forward to talents like you.
## Technical Background
* 1-2+ year of development experience with Android.
* Some experience with HTML, SVG and CSS.
* Experience with Test Driven Development and creating automated unit test using JUnit.
* Able to create a rich UI with thoughtful inputs in UX.
* Fluent in Object-Oriented programming.
* Aware of Component-Based design and Dependency Injection pattern.
* Should know how to publish and maintain an app (or little bit of DevOps).
## Soft Skills
* Able to work with multiple responsibilities.
* Take ownership in the work.
* Willing to work long hours or walk the extra mile.
* Getting to the source of the problem is more important, than putting a band-aid on.
* Code should be easy to read and be its own documentation.
* Shouldn't have an "it works, it's fine" attitude.
Knowledge in app development using XAMARIN tool
Should have project experience using XAMARIN
Candidate must have developed apps for both Android and IOS is compulsory
Job location: Coimbatore
Requirements:
- Strong passion for Programming in general and Android App development in specific.
- Strong problem-solving skills.
- Strong system design and architecture skills - specifically for android.
- Curiosity to tinker around, explore new paradigms, and strong zest for continuous improvement.
- Over 4+ years of Android App development experience with strong basics and complete exposure to Android development.
- Idea/experience of unit and instrumentation testing in Android E2E App development and/or experience of developing SDKs is good to have.










